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BIOL 101 Chp 6: A Tour of the Cell Flashcards

This flashcard set includes the vocabulary words and definitions from Chp 6: A Tour of the Cell (Biology 8E by Campbell et al, 2008).
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96399660light microscopean optical instrument with lenses that refract (bend) visible light to magnify images of specimens
96399661magnificationthe ratio of an object's image size to its real size
96399662resolutiona measure of the clarity of an image; the minimum distance two points can be separated and still be distinguished as two points
96399663contrastthis accentuates differences in parts of a sample being viewed under a microscope
96399664organelleany of several membrane-enclosed structures with specialized functions, suspended in the cytosol of eukaryotic cells
96399665electron microscopea microscope that focuses an electron beam through a specimen, resulting in resolving power a thousandfold greater than that of a light microscope.
96399666cell ultrastructurethe cellular anatomy revealed by an electron microscope
96399667scanning electron microscopea microscope that produces an enlarged, finely detailed, three-dimensional image of an object's surface by using a beam of electrons rather than light
96399668transmission electron microscopea microscope that uses an electron beam to study the internal structures of thinly sectioned specimens
96399669brightfield unstaineda technique in light microscopy that passes light directly through a specimen, generating an image with little contrast
96399670brightfield staineda technique in light microscopy that passes light directly through a fixed (preserved) specimen that has been artificially colored with various dyes to enhance contrast
96399671phase contrasta technique in light microscopy that enhances contrast in unstained cells by amplifying variations in density within a specimen; especially useful for examining living, unpigmented cells
96399672differential interference contrasta technique in light microscopy that uses optical modifications to exaggerate differences in density, making the image appear almost 3-D
96399673fluorescencea technique in light microscopy that shows the locations of specific molecules in the cell by tagging the molecules with special dyes or antibodies that absorb ultraviolet radiation and emit visible light
96399674confocala technique in light microscopy that uses laser and special optics for optical sectioning of fluorescently-stained specimens, illuminating only a single plane; uses a pinhole aperture to eliminate out-of-focus light from a thick sample, creating a 3-D reconstruction
96399675cell fractionationa technique in which cells are broken into pieces and the different cell parts are separated using an ultracentrifuge
96399676plasma membranea thin, flexible barrier composed of two layers of lipids and proteins that encloses the entire cell, regulating what enters and exits the cell
96399677cytosolintracellular fluid that contains dissolved nutrients, ions, soluble and insoluble proteins, and waste products
96399678chromosomea threadlike structure found in dividing cells that contains the genetic information that is passed from one generation of cells to the next
96399679ribosomeone of many small, nonmembranous particles made of RNA and protein found in all cells, on which proteins are assembled; located either free in the cytosol or bound to rough ER or the nuclear envelope
96399680eukaryotic cella type of cell with a membrane-enclosed nucleus and membrane-enclosed organelles; examples of organisms with these cells include protists, plants, fungi, and animals
96399681nucleusan organelle that controls all the activities of a cell and contains hereditary material made of proteins and DNA
96399682prokaryotic cella type of cell lacking a membrane-enclosed nucleus and membrane-enclosed organelles; found only in the domains Bacteria and Archaea
96399683nucleoida dense region of DNA in a prokaryotic cell
96399684cytoplasmthe region of the cell within the membrane that includes the fluid, the cytoskeleton, and all of the organelles except the nucleus
96399685fimbriaethe attachment structures on the surface of some prokaryotes
96399686capsulea jellylike outer coating of many prokaryotes
96399687nuclear envelopea double membrane enclosing the nucleus that is perforated with pores that control the flow of materials in and out of the nucleus
96399688nuclear laminaa net-like array of protein filaments that maintains the shape of the nucleus
96399689chromatinthe long, thin fibers made from a combination of DNA and protein molecules that comprise the genetic material in the nucleus of an eukaryotic cell
96399690nucleolusa nonmembranous structure inside the nucleus, made of RNA and protein, where ribosomes are made
96399691endomembrane systemthe collection of membranes inside and around a eukaryotic cell, related either through direct physical contact or by the transfer of membranous vesicles
96399692vesicleone of many small membrane-bound sacs that function in moving products into, out of, and within a cell
96399693endoplasmic reticuluman extensive membranous network in eukaryotic cells, continuous with the outer nuclear membrane and composed of ribosome-studded (rough) and ribosome-free (smooth) regions; active in membrane synthesis and other synthetic and metabolic processes
96399694smooth ERan extensive network of membranes lacking ribosomes that synthesizes lipids, metabolizes carbohydrates, and detoxifies drugs and poisons
96399695rough ERan extensive network of membranes with ribosomes on its outer surface that makes secretory proteins and serves as a membrane factory for the cell
96399696glycoproteina secretory protein with one or more carbohydrates covalently attached to it
96399697transport vesiclea tiny membranous sac in a cell's cytoplasm that carrying molecules produced by the cell
96399698Golgi apparatusan organelle in eukaryotic cells consisting of stacks of flat membranous sacs that modify, store, and route products of the ER, and synthesize some carbohydrate products
96399699lysosomea membrane-enclosed sac of hydrolytic enzymes that can break down proteins, nucleic acids, and polysaccharides; found in the cytoplasm of animal cells and some protists
96399700phagocytosisa type of endocytosis in which extensions of cytoplasm surround and engulf large particles and take them into the cell; it is carried out by some protists and by certain immune cells of animals
96399701autophagya process in which lysosomes use their hydrolytic enzymes to recycle the cell's own organic materials
96399702food vacuolea membranous sac formed by phagocytosis of microorganisms or particles to be used as nutrients by the cell
96399703contractile vacuolea membranous sac that collects extra water from the cytoplasm and then expels it from the cell; found in certain freshwater protists
96399704central vacuolea membranous sac in a mature plant cell with diverse roles in reproduction, growth, and development
96399705mitochondrionan organelle in eukaryotic cells that serves as the site of aerobic cellular respiration; referred to as the "powerhouse" of the cell because it helps generate chemical energy in the form of ATP
96399706chloroplastan organelle found in cells of plants and photosynthetic protists that absorbs the energy from sunlight and uses it to drive the synthesis of organic compounds from carbon dioxide and water
96399707peroxisomean enzyme-filled, membrane-enclosed organelle in which fatty acids and amino acids are metabolized to hydrogen peroxide that is broken down into harmless products
96399708cristaethe numerous folds in the inner membrane of a mitochondrion that houses electron transport chains and molecules of the enzyme catalyzing the synthesis of ATP
96399709mitochondrial matrixthe fluid enclosed by the inner membrane of a mitochondrion that contains enzymes and substrates for the citric acid cycle
96399710plastidone of a group of membrane-enclosed organelles found in the cells of photosynthetic organisms; used for storage of starches, lipids, or pigments
96399711thylakoidone of the many flattened membrane sacs inside a chloroplast used to convert light energy into chemical energy
96399712granuma stack of membrane-enclosed thylakoids in a chloroplast that function in the light reactions of photosynthesis
96399713stromathe dense fluid of the chloroplast surrounding the thylakoid membranes; involved in the synthesis of organic molecules from carbon dioxide and water
96399714cytoskeletona network of protein filaments within a cell that helps it maintain its shape and is involved in many forms of cell movement
96399715motor proteina protein that interacts with cytoskeletal elements and other cell components, producing movement of the whole cell or parts of the cell
96399716microtubulea small protein fiber composed of tubulin that is found in the cytoplasm of eukaryotic cells, that makes up the cytoskeleton, and plays a role in cell structure and movement
96399717centrosomea structure present in the cytoplasm of animal cells that is important during cell division; functions as a microtubule-organizing center
96399718centrioleone of a pair of tiny structures in the centrosome of an animal cell composed of cylinders of microtubule triplets in a "9 + 0" arrangement
96399719ciliuma short cellular appendage projecting from a cell that contains bundles of microtubules (in a "9 + 2" arrangement) that move a cell through its surroundings or move fluid over a cell's surface
96399720flagelluma long cellular appendage specialized for locomotion; has a core of nine outer doublet microtubules and two inner single microtubules (the "9 + 2" arrangement) ensheathed in an extension of the plasma membrane
96399721basal bodya structure consisting of a "9 + 0" arrangement of microtubule triplets, that organizes the microtubule assembly of a cilium or flagellum
96399722dyneina large contractile protein forming the side-arms of microtubule doublets in cilia and flagella
96399723microfilamenta fiber composed of actin proteins in the cytoplasm of almost every eukaryotic cell, making up part of the cytoskeleton and acting alone or with myosin to cause cell contraction
96399724actina globular protein that links into chains, two of which twist helically about each other, forming microfilaments in muscle and other kinds of cells
96399725cortexthe outer region of cytoplasm in a eukaryotic cell, lying just under the plasma membrane, that has a more gel-like consistency than the inner regions, due to the presence of multiple microfilaments
96399726myosina type of protein filament that acts as a motor protein to cause cell contraction
96399727pseudopodiuma cellular extension of a cell used in locomotion and feeding
96399728cytoplasmic streaminga circular flow of cytoplasm, involving myosin and actin filaments, that speeds the distribution of materials within cells
96399729intermediate filamenta component of the cytoskeleton made of keratin proteins that are specialized for bearing tension, reinforcing the shape of a cell, and fixing the position of certain organelles
96399730cell walla strong supporting layer around the plasma membrane in plants, algae, and some bacteria
96399731primary cell wallin plants, a relatively thin and flexible layer first secreted by a young cell
96399732middle lamellain plants, a thin layer of adhesive extracellular material, primarily pectins, found between the primary walls of adjacent young cells
96399733secondary cell wallin plants, a strong and durable matrix often deposited in several laminated layers for cell protection and support
96399734extracellular matrixthe substance in which animal tissue cells are embedded, consisting of protein and polysaccharides synthesized and secreted by cells
96399735collagena glycoprotein in the extracellular matrix of animal cells that forms strong fibers, found extensively in connective tissue and bone; the most abundant protein in the animal kingdom
96399736proteoglycana glycoprotein in the extracellular matrix of animal cells, rich in carbohydrates
96399737integrina receptor protein built into the plasma membrane that interconnects the extracellular matrix and the cytoskeleton
96399738plasmodesmatathe open channels in a plant cell wall through which strands of cytosol connect from an adjacent cell
96399739tight junctionan intercellular junction in animal cells that prevents the leakage of material between cells
96399740desmosomean intercellular junction in animal cells that functions as a rivet
96399741gap junctionan intercellular junction in animal cells that allows the passage of material or current between cells

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